Technique to detect angle of arrival with low ambiguity

Details Technique to detect angle of arrival with low ambiguity Technique to detect angle of arrival with low ambiguity

1995-05-18

1996-11-05

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342424, G01S 504

Patent

active

055722202

ABSTRACT:
An angle-of-arrival (AOA) phase unwrapping technique using a trellis search to determine the correct AOA. An antenna array having several elements arranged to establish several baselines (element spacings) between different pairs of elements receives RF signals, ranging from 1/2 .lambda. to multiples of 1/2 .lambda.. The search starts from the smallest baseline to determine the unambiguous unwrapped phase. From this least unambiguous unwrapped phase, the process then searches for the closest unwrapped phase on the second smallest baseline, eliminating the ambiguity, and improving the accuracy. As the search processes the larger baselines, the accuracy is increased, while controlling the ambiguity. As a result, the largest baseline yields the most accurate and unambiguous AOA, and results in maximum likelihood estimation of AOA.

REFERENCES:
patent: 4734702 (1988-03-01), Kaplan
patent: 4912475 (1990-03-01), Counselman, III

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